National Street Gazetteer
Yes, it does exist and it's defined by BS7666. A quote from the gazetteer creation guidelines (www.thensg.org.uk):
"No punctuation shall be included within the Street Description, Locality or Town fields unless the punctuation is part of the official street name, for example ‘Westward Ho!’ Ampersands will be replaced with the word ‘AND’. It is recommended that full stops shall not be used as part of any designated name, e.g. St. Stephens Road should be recorded as St Stephens
Abbreviations shall not be used except where they form part of the official name. The only exception is ‘St’ for ‘Saint'
Proper case is recommended to be used throughout all records and when transferring data to other applications including the NSG hub. The use of upper case is also acceptable, however, extra definition is proposed in ASD description fields using case sensitivity and transfer data in upper case would reduce the functionality of this proposal"
Sad isn't it!